The radiation amount of a mobile phone for two half-hour periods per day is equal to ______ to an X-ray for ten seconds.
--You seemed to be impressed by his skill. ---No. It was his courage ________ his skill that really impressed me.
This is the best way I could think of ______________ into the dangerous area.
The news that he failed in the exam _____________ his unhappiness this morning.
We must face the fact __________ our time is limited and we must cherish every minute.
.When and where I shall go for this summer vacation_________ yet